Treating products resembling caoutchouc.



an on, or tree i Ellf Qll' 'lHE-RHINE, GERMANY, MGNUR 1'0 BISCHE IILIhT dz sona FAERIK, F LUDWIGSHAEEhl-ON-WHE-RIHIENE, GER- Patented Dec, 4, ildilli h CUBJPURATIEUN EATING PRQBUGEQ RESEMBEING- CAU'U'EGHtlUG.

11 2% has, specification of Letters Patent.- lilo Drawing.

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'desirab bein subjected to t whereby an ,indiderent as can be over or through the pro uct. it is erties of the said Patent No. l,23d,930, it is stated that products resembling or related to caoutchouc obtained by polymerizingbutadiene and homolo es thereof, and which possess ung properties' can be im roved by he action of cat while avoi 'ng as far as possible the presence of air and referably by carrying out the heating un or pressure less than atmospheric assed rther stated that in some cases the simultaneous employment of nitrogen com ounds, such for instance, as ammonia, met ylamin, anilin, amide acids, glue-and albumen, is very advantageous. lit is also stated that the products thus obtained can be made use of by being vulcanized, products being obtaina le which more or less resemble those obtainable from synthetic or natural rubber,

"l have now found that substances resembiting or related to caoutchouc which have been obtained by pol erizing a butadiene hydrocarbon, and which ma or may not havebeen subjected to furt er treatment, for instance, the treatment described in the aforesaid specification of Patent No. l,288,-= 939 .or to treatment with an acid'when the product is insoluble or didicultly soluble in benzene, can be heated with nurtures of a solid alkali and alkaline carbonates,

whereupon the chemical and ph sical roproducts are c ang'e and the substances, w ich were previously soft or adhesive and more or less easily soluble or capable of swelling in benzene become bit drier and more diiiicultly soluble in benzene or even become partly or wholly insoluble in benzene and only swell when laced therein, ,When the treatment with alali or the like as hereinbefore described has been carried out, the roduct can be washed to remove the alha 1 without any substantial alteration of its roperties taking place. The roduct so 0 tamed can, if desired, be eloquently heated in the manner dobe easily removed from the rolls.

application tiled February at, 19M. serial ltoretlyttt.

scribed in the aforesaid Patent No.1,238,930 or can be treated with an acid and further, can be made use of either before or after suci subsequent treatment by being vulcanize For the pu ose of this invention 1 regard solid alka i alcoholate as equivalent to solid caustic alkali.

The following exaples will serve toillustrate further how the invention may be carried out in practice, but the invention is not confined to these examples. The parts are by weight,

Ewamplc. 1,.

Take 100 parts of the product resembling caoutchouc which has been obtained by heating 100 partsof isoprene with 3 parts of carvene ozonid at 100 C for about It days (see the Example 7 of the French Patent No. 440,173) and mix them with l partrof Emamplc t,

Take 100 parts of the polymerized product obtained from isoprene with sodium in the resence of carbon dionid as described in rample 2 of the specification of the application for "Patent No, l,l92,310, which has subsequently been heated with tartaric acid or acid potassium tartrate, and which consists of a soft product almost completely soluble inbenzene, and min with 3 parts of solid caustic soda and one art of anhydrous sodium carbonate on. co d mixing rolls. 'lhen radually raise the temperature of the rol s to about 100 C. whereupon a dry light brown product is o tained whiclgt can t is almost insoluble iii-benzene, but swells therein and in appearance resemblm 'gutta percha.

a li ht amber colored skin and lid :solid sodium alcoholate and i 0.5 parts of Nib - if this product be heated for a few hours lllll in a current, of ammonia under reduced pressure at from 135l&0 C. (see the aforesaid specification of Patent No. 1,238,930) further alteration takes place. The product becomes firmer and resembles balata.

Ewampl 5. I Take 100 parts of the product obtainable by polymerizing 2.3-dimethyl-L3-butadiene in the resence of carvene ozonid (see the French atent No. 440,173) and mix with 3 parts of solid caustic potash and 1 part of calcined soda, commencing with the rolls cold and gradually heating them to a temperature of about 8090 C. and maintainmg this temperature -tor from half an hour to an hour. The product difi'ers from the initial material, being very much more difiicultly soluble in benzene and, to some extent, only swells therein. It yields a good stable skin.

In a similar manner, other synthetic materials resembling caoutchouc can be treated, for instance, the olymerization prodnot described by Ken akofi' in the Jowmal fz'i-r Pralctische Uhemie, Vol. 64, pages 109- 110, or the products obtainable by any other polymerization process. The quantity of the alkaline substanceand the method of work ing can be varied within considerable limits, for instance, much lower temperatures can be employed and the substance resembling caoutc one can also be employed in solution.

Example 4.

Take IQO parts of the product which has been obtalne from isoprene in the presence masses of carvene ozonid and then beat with 3 arts of solid caustic soda'and 1 part of anhy rous sodium carbonate on the hot roll at from Oil-100 C. for 30 minutes, which product swells in benzene but is practically insoluble therein, and mix intimately with 10 parts of sulfur. Then heat the mass in the vulcanizing press for 2 hours and at a steam pressure of 24 atmospheres; an almost black elastic soft rubber-like product is obtained havin considerable resistance, whereas the initia material which has not been previously treated with caustic soda, when vulcanized in the same manner 'ves rise to yellowish white masses in whic the vulcanization is incomplete.

If the process of 'vulcanizing be shortened, for instance to 1 hour, a gray product is obtained.

Now what I claim is 1. The process of treating rubber-like butadiene polymerization products, consistin in'heating them with a mixture of soli caustic alkali and an alkaline carbonate.

2. The process of treating rubber-like butadiene polymerization products, consisting in heatm them with a mixture of solid caustic alkali and an alkaline carbonate, and then vulcanizing the product so treated.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

EDUARD MUNCH.

Witnesses:

S. S. BERGER, J. Anne. LLOYD. 

